Chuck.



F. E. BRIGHT.

CHUCK.

APPLICATION FILED MAY 3. I911.

Patented .Feb. 12, 1918.

2 SHEETS-SHEET I.

III .LLLULL -F. E. BRIGHT.

CHUCK.

APPLICATION FILED MAY 3. ml.

1 ,256, 1 Patented Feb. 12,1918.

2 SHEETS-SHEEI' 2.

FRED E. BRIGHT, OF PHILADELPHIA, PENNSYLVANIA.

CHUCK.

Application filed May 3, 1917.

To all whom it may concern:

Be it known that I, FRED E. BRIGHT, a citizen of the United States,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, haveinvented certain new and useful Improvements inChucks, of which the following is a specification, reference being badtherein to the accompanying drawing.

This invention relates to work holding chucks, and has reference moreparticularly to chucks adapted to grip the work externally in order thatannular work pieces such as rings, cylinders and the like may be held sothat the inner surfaces thereof may be subjected to grinding, forming,finishing or like operations.

The aim of the invention is to produce a chuck of this type which willbe simple and durable in construction and which may be convenientlyoperated to grip the work with powerful force and hold the same withoutliability of displacement, and with this end in view my inventionconsists of a chuck comprising the novel features of construction andimproved arrangement of parts de scribed in the specification to follow,and the novel parts of which will be set forth in the appended claims. 7

In the accompanying drawings:

Figure 1 is a front face view of my improved chuck showing a work piecein the form of a ring held thereby, the said work piece being brokenaway to expose other parts to view.

Fig. 2 is a longitudinal sectional elevation through thesame, the workpiece being omitted and certain parts being broken away to betterillustrate the construction.

Fig. 3 is a perspective view of the movable gripping jaw, its stem orcarrier, and the operating plunger by which the jaw 1s moved, said partsbeing shown separated from each other.

F ig. 4 is a central longitudinal sectional elevation through theoperating plunger.

Referring to the drawings:

My improved chuck comprises a body 1 of circular disk-like form, a fixedsupporting jaw 2 secured to the face of the body, an opposing grippingjaw 3 sustained by the body and movable to and from the fixed jaw torespectively grip and release the work, and an operating member 4;sustained by the Specification of Letters Patent.

Patented Feb. 12, 1918., Serial No. 168,037.

body and engaging the movable jaw to actuate the same.

The fixed jaw is in the present instance in the form of a. fiat platehaving its inner edge formed with a work seat 2 curved inwardly from acenter coincident with the longitudinal axis of the chuck, against whichwork seat the outer curved surface of the work piece, in the presentinstance the ring A, is adapted to bear, the said seat being provided onits inner edge with a radially extending annular shoulder 52 whichsupports the inner side of the ring. The jaw is seated flatly againstthe face of the chuck body andis detachably connected thereto by meansof fastening screws 2 extending through slots 2 in the jaw and screwedinto the chuck body, whereby the jaw may be adjusted in position so thatit may be reset and properly centered when occasion requires, and may beremoved for grinding or for the substitution of jaws of other sizes, tohold work pieces of different diameters.

The movable jaw 3 comprises a jaw proper 3 and a carrier or stem 3 towhich the jaw proper is detachably connected by means of a fasteningscrew 3 extending through a slot 3 in the jaw proper and screwed intothe same; whereby the jaw is removable and adjustable similar to thefixed jaw, and for like purposes. The stem 3 extends radially of thechuck body and is mounted to move radially thereof in an open radialguiding slot l in the front portion of which slot extends from one edgeof the body across the center thereof and terminates inward of theopposite edge. The slot is undercut to receive guiding ribs 3 extendingoutwardly from the stem, and the latter is formed on its end with aforwardly extending lug 3 which overlies and forms a hearing for theupper edge of the jaw proper,

The jaw proper has its inner edge formed with a work seat 3 curved froma center coincident with the axis of the chuck, and adapted to bearagainst the outer curved surface of the work piece, a radial shoulder 3being formed on the inner side of the seat to bear against the innerside of the ring.

From the construction described it will be seen that the work piece,resting on the work seat of the fixed jaw, may be firmly gripped andheld in fixed position by moving the movable jaw inwardly toward thefixed jaw the chuck body,

the slot.

so that the inner side of the, ring will be exposed and may be subjectedto forming, grinding, finishing and like operations, and by moving themovable jaw outwardly away from the fixed jaw the work "will be releasedand may be freely removed.

The operating memoer & for moving the movable jaw inwardly to grip thework consists of a cylindricalplunger 4 mounted to move aX1ally of thechuck 1n a central axial opening 5 1n the chuck body, the end of theplunger being formed with an open slot l the inner walls of which arefiat and parallel to each other. This slot receives the central portionof the stem 3 of the movable jaw, whichstem is reduced at this point andformed with flat parallel side faces '3 which, in the axial movements ofthe plunger, bear flatly against the walls of 7 One of the walls of theslot is provided with a groove 8 inclined relatively to the axis ofmovement of the plunger,

which groove receives a rib 2 projecting outwardly from the side face ofthe stem and inclined similar to the groove, the groove and rib thusforming wedging surfaces which, when the plunger is moved axiallyrelatively to the stem, will cooperate with each other and willpositively move the stem radially inwardly or outwardly according to thedirection of movement of the plunger. In the form of the parts shown thejaw will be moved inwardly to grip the work when the plunger isretracted, and will be moved outwardly to release the work when theplunger is advanced. But these motions may be reversed by changing theinclination of the groove and rib. The lower edges of the slotted end ofthe plunger are formed with inclined recesses 3 which receivecorrespondingly inclined shoulders 2 on oppositesides of the stem, whichrecesses and shoulders cooperate with each other in assisting in theguiding of the f 'lun e'r in its axial movements and avoids liability ofthe parts to bend. The movement of the plunger may be effected by anyappropriate means and in any appropriate Copies 01 this patent may beobtained for signature.

form or construction of the parts exceptin so far as such limitationsare specified in the claims.

Having thus described my invention, what I claim is: f

1.. In a chuck, the combination of a body,

a gripping jaw having a radial stem mounted in said body and movableinwardly and outwardly to correspondingly move the gripping jaw, and anaxially movable operating member provided With a slot-embracing the.radial stem, the wall of said slot and side of the stem being sorelatively formed that the stem will be moved radially in theaxialmovements of the plunger.

2. In a chuck, the combination of a body having radial guiding openingtherein, a

work supporting jaw sustained by the-body, a gripping aw having a radialstem mounted in said'guiding opening and movable inwardly and outwardlyto carry the gripping jaw respectively to and from the supporting jaw,and an axially movable operating member provided with a slot embracingthe radial stem, the wall of the slot and the side of the same beingprovided with cooperating surfaces inclined relatively to the movementof'the operating m'ember, and adapt ed, in the movements of theoperating memher, to move the inw rdl and outwardly respectively. V

In testimony whereof,- Iha've aflixed my FRED n. BRIGHT.

five cents each. ty'ad'dres'sink the ""Comniissioner ot Patents,Washington, D. G.

